US11306402B2 - Device for obtaining electrolysis products from an alkali metal chloride solution - Google Patents

Device for obtaining electrolysis products from an alkali metal chloride solution Download PDF

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US11306402B2
US11306402B2 US16/641,785 US201816641785A US11306402B2 US 11306402 B2 US11306402 B2 US 11306402B2 US 201816641785 A US201816641785 A US 201816641785A US 11306402 B2 US11306402 B2 US 11306402B2
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catholyte
separator
hydrogen
freshwater
reactor
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Vitold Bakhir
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Blue Safety GmbH
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
    • C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/13—Ozone
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/24—Halogens or compounds thereof
    • C25B1/26—Chlorine; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/081—Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/083—Separating products
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C25B15/087—Recycling of electrolyte to electrochemical cell
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46152—Electrodes characterised by the shape or form
    • C02F2001/46171—Cylindrical or tubular shaped
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/46115—Electrolytic cell with membranes or diaphragms
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/46155—Heating or cooling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4618—Supplying or removing reactants or electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Definitions

  • the invention refers to the field of chemical technology and relates in particular to a device for the electrolysis of aqueous alkali metal chloride solutions in order to produce chlorine, chlorine compounds, oxygen, ozone, and hydroperoxide compounds and can be used in medicine, the food industry, and in the treatment (purification) and sterilization of water.
  • Methods for producing disinfectant solutions are known based on products from the anodization of alkali metal chloride solutions through the treatment of the initial solutions in the anode compartment of electrolysis machines operating using the diaphragm method, using different hydraulic diagrams into which these electrolysis machines are integrated.
  • a production method for the disinfectant is disclosed, and a device for its production is described.
  • the invention describes the preparation of the initial solution by mixing drinking water with alkali chemical chloride solution and the systematic treatment (processing) of the initial solution obtained in the anode compartment of the main electrolysis machine driven using the diaphragm method, and subsequently in the anode compartment of the ancillary electrolysis machine driven using the diaphragm method.
  • the cathode compartments of both electrolysis machines are connected with an auxiliary electrolyte container (catholyte container) and due to the convection and gas-lift current in the electrode compartments of the electrolysis machine, operate in a circulatory manner.
  • the parameters of the disinfectant solution to be produced are regulated by mixing the initial solution with the catholyte from the circuit, which is the same for the main and ancillary electrolysis machine.
  • the introduction of the alkaline catholyte into the initial solution makes it possible to control the pH value of the end product, the disinfectant.
  • the differential pressure on the ceramic ultrafiltration diaphragm in the range of 0.1 to 1.4 kgs/cm 2 of the ancillary electrolysis machine creates a differential pressure in the pore space of the diaphragm, which secures an ion-selective (ion-sensitive) charge transfer through the cations (sodium ions) from the anode compartment into the cathode compartment.
  • the ceramic ultrafiltration diaphragm becomes an efficient, ion-selective separation wall (here a cation-active membrane) during operation in the electrical field in superposition with the filtration field, which is specified by the differential pressure.
  • the present technical solution makes it possible to produce solutions with low corrosiveness through the maintenance of the pH value of the target solution in the neutral range.
  • One disadvantage of this technical solution is that in the target product (disinfectant solution), alongside the degradation products in the anode compartment, accompanying substances (sodium chloride) are created in approximately the same quantity as a result of the method of continuous liquid conversion of the initial substances in the process chain of the device.
  • One disadvantage of the known solution is also that it is difficult to stabilize the operating parameters of the system, which spontaneously change during the course of time, particularly if the mineral content fluctuates as a result of changes to the chemical composition of the drinking water.
  • the presence of a shared catholyte circulation vessel for the main and ancillary electrolysis machine requires a great deal of time for the stabilization of the operation of the system each time it is switched on or if changes are made to the mode of operation of the system (change to the current strength, the flow rate), during the course of which an uncontrolled migration of the bivalent cations of the metals from the cathode compartments into the anode compartments occurs.
  • This phenomenon reduces the duration of the maintenance of the sporicidal activity of the disinfectant obtained, since the presence of bivalent metal ions in the oxidant solution accelerates the disintegration (chemical decomposition 9 of the hypochlorous acid. Even when the electrochemical system is at a standstill, cation hydroxides of the polyvalent metals are deposited in the pores of the diaphragm with mutual, trans-membrane influencing of the concentrated lye (catholyte) with the diluted electrolyte in the anode compartment (anolyte). This phenomenon also leads to an impairment of the operating parameters of the system during the course of time and to a necessary periodic purification of the cathode compartments of the electrochemical reactors with acid solution.
  • the above device contains an electrochemical reactor, which is represented by one or more modular electrochemical elements (cells), which are connected hydraulically in parallel, the anode and cathode compartment of the reactor is separated by a tubular, porous, ceramic separation wall, which is disposed coaxially between the electrodes of the cells, the entrance to the anode compartment is connected with the device for feeding the saline solution under pressure, the exit is connected with the device for stabilizing the specified overpressure in the anode compartment.
  • an electrochemical reactor which is represented by one or more modular electrochemical elements (cells), which are connected hydraulically in parallel, the anode and cathode compartment of the reactor is separated by a tubular, porous, ceramic separation wall, which is disposed coaxially between the electrodes of the cells, the entrance to the anode compartment is connected with the device for feeding the saline solution under pressure, the exit is connected with the device for stabilizing the specified overpressure in the anode compartment.
  • the device has a catholyte circuit, which includes the cathode compartment of the electrochemical reactor, a capacitive (volume) separator for separating the hydrogen from the catholyte, a facility for draining the excess catholyte from the circuit, a heat exchanger for cooling the circulating catholyte, and a device for mixing the gaseous products of the electrochemical anodic reactions with the freshwater flow.
  • the above device can also include a dosing apparatus for feeding the catholyte to the oxidant solution for the purpose of regulating the pH value.
  • the disadvantages of this device lie in the considerable inequality between the local values for the current density in relation to the level of the electromagnetic reactor due to the low speed of the convection and gas-lift circulation of the catholyte in the electrode compartments of the reactor cells.
  • the current density is multiple times higher than in the upper part of the electrode compartment, where the separating hydrogen forms a considerable flow resistance of the electric current. This phenomenon limits the permissible current load for the reactor, as a result of which it has to be operated with a reduced capacity.
  • the electrolyte in the lower part of the cathode compartment becomes overheated and as a result, the initial saline solution is heated, which enters the lower part of the anode compartments of the reactor as a result of heat transfer through the ceramic diaphragm. With the electrolysis, this leads to an increased formation of chlorates, which cause damage to the end product. If the device is operated intermittently, there is an interaction between the catholyte, which is represented by a concentrated sodium hydroxide solution, and the electrolytes in the anode compartment. As a result, insoluble hydroxides of polyvalent metals form in the pore space of the diaphragm, and the pores in the diaphragms of the reactor become clogged.
  • One goal of the invention is to increase the reactor capacity while at the same time improving the quality of the end product, the disinfectant solution of the oxidants, by reducing the content of ancillary components in the form of chloride ions, chlorates and alkali metal cations.
  • the catholyte circuit contains a circulation pump with an overflow device for the return flow of the pump liquid, which continuously secures the forced circulation of the catholyte via the heat exchanger, the cathode compartment and the capacitive (volume) separator for separating the hydrogen from the catholyte, whereby the receiving container of the separator, which is connected to the pump inlet, is lower than the electrochemical reactor, such that the level of the catholyte in the receiving container of the separator, which is determined by the position of the nozzle (side tube) for the discharge of the excess catholyte from the circuit, lies below the inlet nozzle (the inlet nozzles) in the cathode compartment of the electrochemical reactor, and in the line for the discharge of the hydrogen from the capacitive (volume) separator for separation of the hydrogen from the catholyte, a cooled humidity separator is disposed, the condensate collection container of which is connected via
  • FIG. 1 shows the structure diagram of the device with reactor, the electrodes of which have no interior cooling.
  • FIG. 2 shows the structure diagram of the device with reactor, which has a cooled anode that is integrated into the open heat regulation circuit of the assemblies of the device.
  • the device contains the reactor 1 with coaxially disposed electrodes, the anode 2 , the cathode 3 and the diaphragm 4 .
  • the process chain of the anodic synthesis of the oxidant is represented by the anode compartment 5 of the reactor 1 , the entrance of which is connected via the return valve 6 with the exit of the overpressure dosage pump 7 , the entrance to which is connected to the filter 8 , which is immersed in a container with the initial saline solution 9 .
  • the exit of the anode compartment 5 is connected to a stabilization pressure regulator 10 for gaseous products of the electrochemical anodic decomposition of the saline solution 9 .
  • a pressure gage 11 is installed, which is protected against chemically aggressive media by a separation element 12 .
  • the exit of the stabilization pressure regulator 10 for the gas is connected to the entrance of a mixing device 13 for gaseous products of the anodic synthesis with the freshwater flow.
  • This receiving container has a lower outlet nozzle for emptying the container, a central overflow nozzle for draining the excess catholyte, an upper nozzle for draining the hydrogen, and a nozzle for feeding the catholyte with hydrogen from the cathode compartment 14 of the electrochemical reactor 1 , which is accordingly connected to the exit of the cathode compartment 14 .
  • a humidity separator 19 is disposed, which is determined for the removal of the condensation water from the hydrogen, which predominantly contains free hydroxyl groups.
  • the exit of the condensation chamber of the humidity separator 19 of the hydrogen is connected via a dosage pump 20 to the feed of the cooling water to the mixing device 13 for gaseous oxidants with the freshwater flow.
  • the freshwater from which the polyvalent metal ions have been removed is guided to the device at the entrance to the hydrogen-humidity separator 19 via a mechanical filter 21 , an electromagnetic, normally closed, valve 22 , a stabilization pressure regulator “according to the default setting” 23 , and the flow controller 24 .
  • the cooling water After exiting the hydrogen-humidity separator 19 the cooling water is guided to the entrance to the catholyte heat exchanger 15 , and then travels from the exit of the heat exchanger 15 to the entrance to the mixing device 13 for the gaseous products of the anodic synthesis with the freshwater flow.
  • FIG. 2 shows an additional element of the cooling system, the cooled anode 2 of the reactor 1 , which is disposed for the cooling water between the hydrogen-humidity separator 19 and the catholyte heat exchanger 15 .
  • the device functions as follows.
  • the sodium chloride initial solution 9 which is produced with purified (softened) or distilled water and chemically pure salt, is filled into the container. Distilled water is filled into the receiving container of the separator 18 via the nozzle for the hydrogen draining, for the purpose of separating the hydrogen from the catholyte. This is a one-off procedure and is only required when the device is first put into operation.
  • the following are connected: the water feed nozzle at the entrance to the mechanical filter 21 to the fresh (drinking) water pressure line.
  • the device is switched on by applying voltage to the normally closed electromagnetic valve 22 .
  • the water flow volume through the device is regulated with a stabilization pressure regulator 23 “according to the default setting”, wherein the set value is set.
  • the water flow which flows through the flow controller 24 , triggers it and switches on the pumps 16 , 20 or 7 and the current supply unit of the electrochemical reactor 1 (not shown in FIGS. 1 and 2 ).
  • the pressure in the anode compartment 5 is regulated with the stabilization gas pressure regulator 10 “up to the default setting”, wherein the set value is set and controlled by means of the pressure gage 11 .
  • the distilled water is enriched with sodium ions, which are selected via the porous ceramic diaphragm 4 in the reactor 1 from the saline solution that fills the anode compartment 5 .
  • the volume flow of saline solution, which reaches the anode compartment 5 of the reactor 1 , is selected such that at the exit of the anode compartment, only gas is obtained, which is above all represented by chlorine with a small quantity of chlorine dioxide, oxygen and ozone. This gas is saturated with water, the microdroplets of which contain hydrogen peroxide and additional metastable hydroperoxide compounds.
  • the synthesis reaction occurs of chlorine dioxide directly from the saline solution and from hydrochloric acid, which is formed during the dissolution of molecular chlorine close to the anode: (Cl 2 +H 2 O ⁇ HOCl+HCl): 2NaCl+6H 2 O ⁇ 10 e ⁇ 2ClO 2 +2NaOH+5H 2 ; HCl+2H 2 O ⁇ 5 e ⁇ ClO 2 +5H.
  • ozone is form through direct decomposition of water and through oxidation of released oxygen: 3H 2 O ⁇ 6 e ⁇ O 3 +6H.;2H 2 O ⁇ 4 e ⁇ 4H.+O 2 ; ⁇ O 2 +H 2 O ⁇ 2 e ⁇ O 3 +2H.
  • hypochlorous acid the quantity of which in the solution is limited by the reduced pH value that results when hydrochloric acids are formed.
  • the pH value can be changed by adding lye, i.e. sodium hydroxide, for example.
  • lye i.e. sodium hydroxide
  • sodium hypochlorite is a salt of a weak acid (hypochlorous acid) and a strong alkali (sodium hydroxide), but has anti-microbial activity, which in relation to the hypochlorous acid only constitutes 1/250 to 1/350 of its activity.
  • the formation of sodium hypochlorite with simultaneous increase in the pH value with simultaneous increase in the concentration of the hypochlorous acid can be avoided by the addition of water to the reaction zone (the water contain free hydroxyl groups, which are formed during the condensation of water from the hydrogen, which is generated in the cathode compartment 14 of the electrochemical reactor 1 ).
  • the condensate from the hydrogen-humidity separator 19 is added to the water flowing through with the aid of the pump 20 , which contributes to the flow of an overconcentrated, hypochlorous acid and to a significant reduction in the concentration of the sodium ions in the product obtained, the oxidant solution, which is formed in the mixer 13 when the gaseous products of the anodic synthesis are dissolved in the flowing freshwater.
  • the pH value of the product created is in the region of 5.0-6.5.
  • the pumps 7 , 16 and 20 and the current supply of the electrochemical reactor 1 switch off.
  • the catholyte flows out of the cathode compartment 14 as a result of gravity into the receiving container of the separator 18 , thanks to the overflow device 17 .
  • the excess catholyte from the receiving container of the separator 18 is here discharged into the draining line through the overflow nozzle in the upper part of the receiving container (D).
  • the anolyte remaining in the anode compartment 5 with a pH value of below 3 is filtered through the diaphragm 4 as a result of the overpressure, and in so doing, dissolves the hydroxide deposits of the polyvalent metals, which may occur in small quantities in the initial saline solution.
  • all current consuming parts start working simultaneously in the previously set mode, wherein they secure a rapid stabilization of the process that lasts just a few seconds.
  • the catholyte is drained from the receiving container of the separator 18 into the drainage line by means of outlet nozzles (D) with a valve disposed in the floor of the container.
  • the device was tested in comparison with the prototype, which was produced according to U.S. Pat. No. 7,897,023 B2.
  • Both comparable devices contained an electrochemical reactor, which is represented by an electrochemical, modular element (cell) according to GB 2479286 B (electrochemical cell no. 5, Table 2).
  • the initial saline solution contains 250 g/l of sodium chloride; the content of chlorides and calcium and magnesium sulphates in the initial solution was 0.2 mg/l.
  • the initial solution was used during operation of the two comparable devices. The tests were conducted at a temperature of the ambient air of 20° C., a temperature of the initial saline solution of 20° C., a temperature of the drinking tap water of 15° C.
  • the current strength over the electrochemical reactor 1 in the prototype of the device was 6 A, with a voltage of 6 V, in the device according to the new technical solution, these were 16 A and 5 V. Accordingly, the yield of oxidants in the prototype was 6.0 g/h, and in the device according to the new technical solution, 20.5 g/h.
  • the oxidant solution produced in the prototype at a speed of 12 l/h had an oxidant concentration of 500 mg/l with a pH value of 2.8 and a total mineral content of 0.96 g/l.
  • the pH value at the exit increased to 6.0 with a simultaneous increase in the mineral content of the solution to 1.5 g/l.
  • the oxidant solution which is produced at a speed of 41 l/h in the device according to the new technical solution, had a pH value of 3.1 with an oxidant concentration of 500 mg/l and a total mineral content of 0.67 g/l.
  • the pH value of the oxidant solution increased to 6.0, with a simultaneous increase in the mineral content to 0.72 g/l.
  • the time for achieving operating status following a standstill of the prototype device was 5 minutes, compared to 25 seconds for achieving operating status with the device according to the new technical solution.
  • the current strength over the reactor, with an unchanged temperature (30° C.) reached 20 A with a voltage of 6 V, which entailed a corresponding increase in the capacity of the device in relation to the end product, the oxidant solution, to 52 liters per hour with the above parameters.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
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  • Sustainable Development (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
US16/641,785 2017-08-25 2018-08-24 Device for obtaining electrolysis products from an alkali metal chloride solution Active 2039-02-03 US11306402B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017119566.1A DE102017119566B4 (de) 2017-08-25 2017-08-25 Vorrichtung zur Gewinnung von Produkten der Elektrolyse von Alkalimetallchloridlösung
DE102017119566.1 2017-08-25
PCT/EP2018/072925 WO2019038440A1 (fr) 2017-08-25 2018-08-24 Dispositif pour l'obtention des produits de l'électrolyse d'une solution de chlorure de métal alcalin

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KR20200044904A (ko) 2020-04-29
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CA3073862A1 (fr) 2019-02-28
EP3673098A1 (fr) 2020-07-01
RU2020105730A (ru) 2021-09-27
RU2020105730A3 (fr) 2022-01-26
BR112020003561A2 (pt) 2020-09-01
CN111344437A (zh) 2020-06-26
DE102017119566B4 (de) 2021-08-12
AU2018321042A1 (en) 2020-03-05
WO2019038440A1 (fr) 2019-02-28
EP3673098B1 (fr) 2023-12-06
DE102017119566A1 (de) 2019-02-28

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